Distinction of different syn- and late orogenic Pan-African sedimentary sequences by metamorphic grade and illite crystallinity: (W. Zeidun, Central Eastern Desert, Egypt) - Osman, Ali Farrag; Greiling, Reinhard O.; Warr, Laurence N.; Ragab, A. I.; Ramly, Mahmoud Fawzy el- (Geoscientific research in Northeast Africa, 1993)